Ok, some nerd please explain the switches on this IRL calculator app

The first one lets you turn K on or off
- K.
  
  Damn, it worked.
  
  From OKLAHOMA don't have no clue, don't why you think an Ok nerd would know over another state? /s
- F

Found some documentation listing the two middle switches as the rounding switch (up fraction down) and the decimal switch (auto? 0 to 6 then hex?). No idea on the other two.
http://www.calcuseum.com/SCRAPBOOK/BONUS/32853/1.htm
Decimal switch: [A-0-2-3-4-6-F], Round switch: [(ArrowUp)-5/4-(ArrowDown)], Miscellaneous switch: [(Blank)-K .-(Sigma)],
- Nice!

Some guesses by ChatGPT:
Left Switch ("K" setting):
K: Likely for a "constant mode," where the calculator uses one operand as a constant for repeated >calculations (e.g., multiplying several numbers by the same value).
The other position is likely "normal mode," disabling this feature.
Middle Switch ("A/2/4/6" etc.):
This could control decimal rounding or precision:
"A" might stand for "automatic" mode.
"0, 2, 3, 4, 6" refers to the number of decimal places displayed or used in calculations.
"F" likely stands for "full precision," using all available decimal places.
Right Switch ("Σ" setting):
Σ: Likely enables a "summation mode," where the calculator automatically adds results to a running total (useful for bookkeeping or repetitive additions).
The other position disables this mode.
Being Swedish the "constant mode" seems likely as we often used k (for "konstant") in school math to represent a constant (e.g. for the slope of a line).
- Bold of you to mention chat gpt in a comment, I feel like any mention of it tends to get down voted to hell, even when it's appropriately used as you did here
  
  Those fucking things are great as tools to figure stuff out. Can't trust them to be correct, but you can trust them to shoot the shit and dribble the ball to a destination which is unknowable to man
  
  At least it can give you more precise questions to google to verify its output
  
  Yeah, people are really bad at nuance and context. Even something that is normally a shitty tool can have uses.
- Until I saw your post, I was going to guess the A,0,2,3,4,6,F switch would switch it into different numerical bases. Like, if you wanted to do math in binary, switch to the "2" position. "0" (or maybe "A") would be base 10. "F" would be hexadecimal. But what you have definitely makes more sense.
  
  F is 15, so that'd be weird for hex, and I've never seen base 4 or 6 used for anything, base 8 is common for some things but missing here.
- This looks mostly right. The precision slider is ~~definitely~~ probably only for the output, not calculations. The (up | 5/4 | down) is (always round up | round 5+ up and 4- down | always round down)
  What I'd like to know is how the A and F settings are different.
  
  Auto to me (if A is Auto) sounds like it'd truncate unnecessary digits (4 or 4.0 instead of 4.0000) maybe? Whereas if F is Full then you'd get full precision?
  Idk seems logical but not especially useful, probably not a great guess.
- Did you just plug the picture into chatgpt? It's awesome if something like that works :o
  
  Yes I uploaded the image and asked it the same question as OP
- It seems to be right on the K switch. And yeah. Konstant makes sense.
  The numbered switch seems to check out at least. Other than the F. F just gives me a single decimal. edit: no... Three...?
  Not sure about the right switch. It adds an I in the upper right corner and it seems possible to flip between different calculation results. Maybe?
  
  F is likely Floating point - so, just regular precision. Not sure what A would be, then
  
  For checking F try typing in an irrational number. Like 22/7
- Given the available context, I'm inclined to agree with ChatGPT. I can't see those listed being anything else

I see a lot of wrong info on the the decimal slider. This is how it works:
A is for "Add-mode". This means that 2 decimals are always assumed. It's used for adding a lot of 2 decimal numbers, because you'll never have to press the decimal key. If you've ever worked a credit card terminal and having to enter 200 to get 2.00$, that's how this setting works.
0-6 are fixed and rounded according to the rounding setting.
The decimal F is for floating. It'll use the most relevant amount of decimals.
Another funny button is MU which is Mark Up. It's used with the percentage button. It's a backward ass way to do percentages. You'll enter a value and then MU the percentage that you want from the result, instead of the input. Say you have product that costs 100 and you'll want to mark it up, so you'll get 20% of your new sales price as profit. Press 100 MU 20% and it should show 125, which is your sales price, because 25 is the 20% of 125. It doesn't make sense to me why anyone ever needed that button.
- Actually I found this site (in German) which says that the MU is for Impact Calculation. Which... I wouldn't even begin to try to understand how I'd use.
  
  According to that site, it also has an item counter. Normally this also on the print, but without a printer I guess it needs a button for that. Perhaps the IC button?
  Remember that on desktop calculators the operations are entered reverse of ordinary pocket calculators. First you press the number and then you press the operation. So to do 100 - 50 you need to press "100 + 50 -"
  Same for the MU. First you need a number to be added. Then MU some number as percentage and +=.
- That's some great info!
  The back of it says it's been used at a local insurance company. Wonder if that button is useful there somehow.
  Do you know what the rightmost row is about? And the two buttons above C and CE?
  edit: the MU function doesn't seem to do anything. Maybe I'm missing something.
  
  Most of the other buttons appears to be for the internal carrier (aka memory). Lets say that the main display is one column in Excel. The memory is then a second column, where you can pull or push the displayed result in a variety of ways. This allows you to do some calculation, throw the result into memory, clear he entry and do another calculation and add that to the previously stored result and such. The slider labeled with the sum sign is a grand total. It'll cause all your results to be summarized. I'm not sure how to display it. Maybe it's only shown on the print.
  The MU button doesn't "do" anything by itself. You'll need to press 100. Press MU. press 20. Press %. Or maybe the sequence is different. It would be nice with a manual.

"What's up with your calculator, bruh? It says 2+2 equals infinity."
"Did you set it to F?"
"Yeah. What's F mean?"
"It means it's Fucked."

No.
- Thanks, I already know no. means number
  
  Nomber*
  
  No means no, you misogynist pig!
- apology for poor english
  when were you when svenska calculator post drop?
  i was sat at home eating IKEA meatballs when notification ring
  ‘Calculator switch set to K’
  ‘no’
  
  It’s an older copypasta sir, but it checks out.

Looks like Facit calculators were originally manufactured in Sweden and then later Japan. No mention of that particular model on this website, however
- I know. I'm in Sweden. Facit was a big thing in its day. This one's made by Sharp in Japan. It's a 2102. Or maybe that's when the manual will be released.

Well, I see a round up, didn't round, or round down switch. The next one might be how many points if precision??. The last one has to do with sum vs series somehow.
That is interesting, though. Beyond me, that's for sure
- If I move the larger switch to A, everything is done in decimal. Maybe that's a hint?

They seem to have some kind of function regarding how to perform or display calculations.
- This app isn't very intuitive

The right-most switch lets you turn on sigma mode.
- I would assume that's summation mode, so everything you enter is treated as a running total. This looks like a business calculator.
- That's pretty sigma

Trying to find the sum of my meme ransom please respond

On the top left you can change from none or K
- Isn't it decimal or K?
  
  k

It might allow you to place numbers in different spots?

wat
- OK, SOME NERD PLEASE EXPLAIN THE SWITCHES ON THIS IRL CALCULATOR APP!

Now someone explain the right and left columns of buttons
- Right! I haven't even thought about when yet.
  All I can tell you is that the right side is somehow related to the rightmost switch. C and CE do what they do on any calculator.

Left Switch ("K" setting):

Middle Switch ("A/2/4/6" etc.):

Right Switch ("Σ" setting):